Sir Paul McCartney has said that plans to release the Beatles' songs on iTunes have hit further obstacles.

The latest delay is reportedly down to Apple Corp - which houses the group's back catalogue - and copyright holder EMI failing to agree terms to release the tracks on iTunes and other download services.

McCartney said: "That is constantly being talked of - we'd like to do it. What happens is, when something's as big as the Beatles, it's heavy negotiations.

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"We are very for it; we've been pushing it. But there are a couple of sticking points, I understand. So the last word I got back was that it had stalled, the whole process.

"[EMI executives] want something we're not prepared to give them. Hey, sounds like the music business.